Specification for hose clamps and hose bandages for fire brigade use, Part 2: Hose bandages

IS 5612 Part 2 (1977) - Scope: Sampling and Conformity

Key Points from Clause 1.2 & Appendix A:

• Sampling is done per lot to check conformity.
• Sample size and permissible defective units depend on lot size as per Table 1.

• Acceptance Criterion:
  If defective units ≤ permissible defective number (col 3), lot is accepted.

Additional Specifications:

• Nylon tape for binding edges must conform to IS 4228-1967 (Clause 3.2).
• Sampling details and conformity criteria are governed by Appendix A, Clause 9.1.

Summary Formula for Acceptance:

[ \text{Accept Lot if } D \leq D_{perm} ]

Where:

• (D) = Number of defective units found in sample
• (D_{perm}) = Permissible number of defective units from Table 1

flowchart TD
    A[Start: Lot Received] --> B{Lot Size?}
    B -->|≤ 8| C[Sample All Units]
    B -->|9-15| D[Sample 8 Units]
    B -->|16-25| E[Sample 13 Units]
    B -->|26-50| F[Sample 20 Units]
    C --> G[Check Defectives ≤ 0?]
    D --> G
    E --> G
    F --> H[Check Defectives ≤ 1?]
    G -->|Yes| I[Accept Lot]
    G -->|No| J[Reject Lot]
    H -->|Yes| I
    H -->|No| J

This ensures quality control per IS 5612 Part 2 standards.

IS 5612 Part 2 (1977) – Definition and Components: Key Points

Scope: Specification for Hose-Bandages used in Fire Brigade.

Key Definitions & Components (from IS 5612 Part 2)

• Hose-Bandages: Devices used to secure and support fire hoses.
• Lot: A collection of hose-bandages grouped for sampling/testing.
• Sampling: Testing of hose-bandages from each lot to ensure conformity.

Sampling & Conformity (Clause 1.2 & Appendix A)

• Conformity Criterion:
  If number of defectives ≤ permissible defective (d), lot conforms (Clause 2.1.1).

Notes on Measurement & Rounding (Clause 0.3)

• Final test values rounded per IS 2-1960.
• Maintain significant figures as per specified values.

flowchart TD
    A[Lot of Hose-Bandages] --> B[Select Sample Size (Table 1)]
    B --> C[Test Sample]
    C --> D{Number of Defectives ≤ Permissible?}
    D -->|Yes| E[Lot Conforms]
    D -->|No| F[Lot Rejected]

This ensures quality control through statistically valid sampling and clear acceptance criteria.

IS 5612 (Part 2) - Materials & Sampling Key Points

Materials:

• Nylon Tape: For binding edges, use nylon tape conforming to IS: 4228-1967 (Clause 3.2).

Sampling & Quality Control (Clause 1.2 & A-2.1.1):

• Lot conformity is checked by sampling per Table 1.
• If defectives ≤ permissible number in Table 1, the lot is accepted.

Key Specification:

• All hose-bandages must meet material, shape, dimensions, workmanship, and finish as per IS 5612 (Part II).

Summary Diagram of Sampling Decision:

flowchart TD
    A[Start: Select Lot Size] --> B{Lot Size?}
    B -->|≤8| C[Sample All, Accept if 0 defectives]
    B -->|9-15| D[Sample 8, Accept if 0 defectives]
    B -->|16-25| E[Sample 13, Accept if 0 defectives]
    B -->|26-50| F[Sample 20, Accept if ≤1 defective]

For detailed testing and material specs, refer to IS 4228 for nylon tape and IS 5612 Part II for hose-bandage requirements.

IS 5612 Part 2 (1977) - Shape and Dimensions of Hose-Bandages

• Nylon Binding:

  • Nylon tape for binding edges shall conform to IS: 4228-1967 (for aeronautical nylon tapes).
  • Width of nylon tape: 25 mm, stitched.

• Shape & Dimensions (Clause 4.1):

  • Hose-bandages must follow the shape and dimensions as shown in Fig. 1 (not provided here, but typically a flat band with stitched edges).
  • The bandage is essentially a flat nylon tape with stitched edges for durability.

• Sampling & Quality Control (Table 1):

  Lot Size	Sample Size	Permissible Defective
  Up to 8	All	0
  9 to 15	8	0
  16 to 25	13	0
  26 to 50	20	1

• Summary:
  Hose-bandages are made from 25 mm wide nylon tape, stitched, conforming to aeronautical tape specs, and dimensions per Fig.1. Sampling for quality follows Table 1 for defect limits.

flowchart LR
    A[Nylon Tape 25mm] --> B[Stitched Edges]
    B --> C[Hose-Bandage Shape (Fig.1)]
    C --> D[Quality Sampling per Table 1]

For exact dimensions, refer to Fig. 1 in IS 5612 Part 2.

IS 5612 Part 2: Workmanship and Finish - Key Points

1. Workmanship (Clause 5.1)

• All sharp edges shall be rounded and surfaces smooth.
• Ensures safety and quality in hose bandages and related components.

2. Sampling and Defects (Clause 1.2 & Table 1)

• Lot conformity: If defective items ≤ permissible number, lot is accepted.

3. Hose Bandage Dimensions (Clause 4.1)

• Bandages must conform to Fig. 1 (Nylon binding, 25 mm stitched tape).

Summary:

• Workmanship: Smooth, rounded edges.
• Sampling: Defect limits per lot size in Table 1.
• Finish: Nylon tape 25 mm wide, stitched as per Fig. 1.

flowchart TD
    A[Lot Size] --> B[Sample Size]
    B --> C{Defective Items}
    C -->|≤ Permissible| D[Lot Accepted]
    C -->|> Permissible| E[Lot Rejected]

This ensures quality control and safety compliance in production per IS 5612 Part 2.

IS 5612 Part 2: Test for Leakage – Key Points

Sampling for Leakage Test (Clause 1.2 & Table 1)

• Sample size depends on lot size:

• Samples must be selected randomly (Clause 1.3).

Test Procedure (Clause 6 & A-2)

• Visually inspect hose-bandages for:

  • Shape & dimensions (Clause 4)
  • Workmanship & finish (Clause 5)
  • Leakage (Clause 6)

• Any defect in these aspects means the piece is defective.

Additional Specifications

• All sharp edges must be rounded and surfaces smooth (Clause 5.1) to prevent leakage.

Summary

• Perform leakage test on random samples per Table 1.
• Zero tolerance for defects in small lots; 1 defective allowed in larger lots.
• Visual and leakage inspection must confirm no leakage or defects.

flowchart TD
    A[Select Lot] --> B[Determine Sample Size (Table 1)]
    B --> C[Random Sampling]
    C --> D[Visual Inspection]
    D --> E{Defects?}
    E -- Yes --> F[Reject Lot or Defective Pieces]
    E -- No --> G[Accept Lot]

IS 5612 Part 2: Marking - Key Points & Specifications

• Clause 7.1.1:
  Products may be marked with the Standard Mark indicating conformity.

• Clause 7.1.2:
  Use of the Standard Mark is regulated by the Bureau of Indian Standards Act, 1986. Licensing conditions must be obtained from BIS.

• Sampling for Marking Conformity (Clause 1.2 & Table 1):
  For lot conformity, sample sizes and permissible defective counts are:

  Lot Size	Sample Size	Permissible Defective
  Up to 8	All	0
  9 to 15	8	0
  16 to 25	13	0
  26 to 50	20	1

• Additional Specs:

  • Nylon tape for binding edges must conform to IS 4228-1967 (Clause 3.2).
  • Shape and dimensions are detailed in Clause 4 (refer to the standard for exact values).

Summary Diagram of Sampling & Marking Process

flowchart TD
    A[Lot Received] --> B{Lot Size}
    B -->|≤8| C[Inspect All Items]
    B -->|9-15| D[Sample 8 Items]
    B -->|16-25| E[Sample 13 Items]
    B -->|26-50| F[Sample 20 Items]
    C --> G{Defective?}
    D --> G
    E --> G
    F --> G
    G -->|Permissible Defects ≤ allowed| H[Mark with Standard Mark]
    G -->|Exceeds Permissible Defects| I[Reject Lot]

Note: For detailed marking dimensions and exact shape, refer to Clause 4 of IS 5612 Part 2.

IS 5612 Part 2 – Packing of Hose-Bandages

Key Specifications (Clause 8.1)

• Packing Method: Each hose-bandage must be:
  • Neatly rolled.
  • Enclosed individually in a cellophane shroud.
• Carton Packing: Pack six hose-bandages per corrugated board carton.

Sampling and Conformity (Clause 1.2 & Table 1)

• Sampling must be random (Clause 1.3) using random number tables.
• Nylon tape for binding edges must conform to IS 4228-1967 (Clause 3.2).

Summary:

• Packing: Individual cellophane wrap + 6 per carton.
• Sampling: Follow Table 1 for sample size and defect limits.
• Binding Tape: Use IS 4228 nylon tape.

flowchart TD
    A[Hose-bandage] --> B[Roll neatly]
    B --> C[Wrap in cellophane shroud]
    C --> D[Pack 6 in corrugated carton]
    D --> E[Sampling as per Table 1]
    E --> F{Defective?}
    F -->|No| G[Accept lot]
    F -->|Yes| H[Reject lot]

Sampling and Criteria for Conformity as per IS 5612 Part 2

1. Sampling Procedure (Clause 1.2, A-1.3)

• Select hose-bandages randomly from each lot using random number tables.
• Sample size depends on lot size as per Table 1.

2. Scale of Sampling (Table 1)

3. Criteria for Conformity (Clause 9.1, A-2.1.1)

• If the number of defective items in the sample ≤ permissible defective number (col 3), the lot is accepted.
• Otherwise, the lot is rejected.

Summary Flowchart

flowchart TD
    A[Select Lot] --> B[Determine Lot Size]
    B --> C{Lot Size?}
    C -->|Up to 8| D[Sample = All]
    C -->|9 to 15| E[Sample = 8]
    C -->|16 to 25| F[Sample = 13]
    C -->|26 to 50| G[Sample = 20]
    D --> H[Count Defectives]
    E --> H
    F --> H
    G --> H
    H --> I{Defectives ≤ Permissible?}
    I -->|Yes| J[Accept Lot]
    I -->|No| K[Reject Lot]

Key points:

• Sampling is by random selection.
• Permissible defectives are zero for smaller lots; one allowed for 26-50.
• Testing each lot separately ensures quality control compliance.

IS 5612 Part 2 (1977) - Sampling & Criteria for Conformity

A-1. Scale of Sampling (Appendix A, Clause 1.2)

• Sampling is done per lot.
• Random selection using random number tables (Clause A-1.3).

A-2. Criteria for Conformity (Clause 8.1)

• Each hose-bandage must be:
  • Neatly rolled.
  • Individually enclosed in cellophane shrouds.
  • Packed in corrugated cartons (6 per carton).

Summary:

• Sample size and acceptance criteria depend on lot size (see table).
• Zero defects allowed for smaller lots; 1 defective allowed for lots 26-50.
• Sampling ensures quality control before acceptance.

flowchart TD
    A[Lot Received] --> B[Random Sampling as per Table]
    B --> C{Number of Defective in Sample}
    C -->|<= Permissible| D[Lot Accepted]
    C -->|> Permissible| E[Lot Rejected]